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8132546 Control strategy for multi-stroke engine system  
An engine system and a method of operation are described. The engine may be operating in two-stroke and four-stroke modes while still maintaining a target exhaust air-fuel ratio.
8122857 Control architecture and optimal strategy for switching between 2-stroke and 4-stroke modes of HCCI operation  
Engine correction inputs to control oscillation in an engine output in a transition between 2-stroke and 4-stroke engine cycle modes of an HCCI engine are determined as follows: for each mode,...
8118000 Multi-stroke internal combustion engine  
An internal combustion engine system and method of its operation are described. As one example, the method includes: repeatedly opening a first intake valve of a combustion chamber of the engine...
8011331 Eight-stroke engine cycle  
An eight-stroke engine cycle may include a first stroke forming an intake stroke and including opening an intake valve and providing a first fuel mass to the combustion chamber. The second stroke...
7997237 Multi-stroke internal combustion engine  
An example engine method utilizes a first intake valve actuated by a first camshaft once every four piston strokes and a second intake valve actuated by a second camshaft once every four piston...
7963267 Multi-stroke variable displacement engine  
A vehicle propulsion system and method of operation are presented. As one example, cylinder deactivation and transitioning from four to two strokes is coordinated with transmission shifting to...
7946259 Multi-stroke internal combustion engine  
An engine system and method of its operation are described. The method includes: operating the combustion chamber in a four stroke cycle by repeatedly opening a first exhaust valve of the...
7673590 Method for exhaust heat generation by variable stroke combustion cycles and valves  
A method for operating an engine having at least a first and second cylinder, comprising operating the first cylinder with a spark timing more retarded than a spark timing of a second cylinder; and...
7650745 Method to reduce engine emissions for an engine capable of multi-stroke operation and having a catalyst  
A method to control valves in a cylinder operating in a multi-stroke cylinder mode. Valves are controlled to improve engine emissions as operating conditions vary.
7624709 Cao cycles of internal combustion engine with increased expansion ratio, constant-volume combustion, variable compression ratio, and cold start mechanism  
This invention provides an internal combustion engine that has a substantially increased expansion ratio, a variable compression ratio, and subsequently a significantly improved thermal efficiency....
7574982 Engine cycles  
An 8 Stroke and 4 Stroke cycle change engine where alternate ‘air only’ inductions are used under half load provided by alternate opening inlet valves operated by Electro-Magnetic, Ele...
7481185 Multi-mode 2-stroke/4-stroke internal combustion engine  
In a multi-mode, 2-stroke/4-stroke internal combustion engine operation, by switching the engine stroke from 4-stroke operation to 2-stroke operation so that the combustion frequency is doubled,...
7421981 Modulated combined lubrication and control pressure system for two-stroke/four-stroke switching  
A switching mechanism capable of switching between a two-stroke operation and a four-stroke operation of an engine as desired, wherein the switching mechanism is switchable between engagement with...
7377236 System and method for exhaust heat generation using electrically actuated cylinder valves and variable stroke combustion cycles  
A method for operating an engine having at least a first and second cylinder, including operating the first cylinder with a spark timing more retarded than a spark timing of a second cylinder; and...
7347170 Frequency modulated VCR-engine  
A control method for the modulation of the torque of piston combustion engine that has a compression chamber (6) of variable volume and operable inlet valves (3). The torque requested for a...
7255066 Valve selection for an engine operating in a multi-stroke cylinder mode  
A method to control valve patterns in a cylinder operating in a multi-stroke cylinder mode. Valves are controlled to improve drivability and emissions.
7231892 Method for extending HCCI load range using a two-stroke cycle and variable valve actuation  
A method and system for extending the load range of Homogeneous Charge Compression Ignition (HCCI) in an internal combustion engine includes detecting a current state of the engine, detecting a...
7182046 Deformable combustion chamber-based internal combustion engine and generator  
A reciprocating internal combustion engine is based on Homogenous Charge Compression Ignition (HCCI) that occurs in a deformable, resonant combustion chamber and that is coupled mechanically to...
7082898 Internal combustion engine of compression ignition type  
The present invention aims at expanding an operation range for allowing a compression ignition combustion operation. The present invention provides an internal combustion engine of a compression...
7069140 Engine operation without cam sensor  
Disclosed herein are methods of cranking and/or operating an engine that eliminates the need for use of a cam sensor. The methods implemented with internal combustion engine comprising a plurality...
7047910 Method of torque modulation  
A control method for modulating the torque in an internal combustion engine with mechanical power transmission and with pneumatically, hydraulically or electromagnetically controllable valves that...
7036465 Two-stroke and four-stroke switching mechanism  
A switching mechanism capable of switching between a two-stroke and a four-stroke operation of an engine as desired, wherein the switching mechanism is switchable between engagement with a first...
7031821 Electromagnetic valve control in an internal combustion engine with an asymmetric exhaust system design  
A system and method to control engine valves of an internal combustion engine is shown. Electromechanical valves are controlled in a manner to reduce hydrocarbon emissions of an internal combustion...
6971338 Variable cycle engine and operation mode switching method  
An engine is operated in accordance with a plurality of operation modes obtained by combining one of a 4-cycle mode and a 2-cycle mode with one of a combustion ignition control where an ignition is...
6966309 In-cylinder reburn method for emissions reduction  
A method applicable to lean-burn combustion engines uses excess air from previous engine cycles in a reburning process to provide exhaust gases characteristic of stoichiometric combustion....
6758170 Multi-cycle trainable piston engine  
A multiple-cycle engine is provided that alternates between two-cycle and four-cycle operation in response to measured engine conditions. Each piston is ball and socket mounted to allow the piston...
6619242 Combustion control apparatus for engine  
A combustion control apparatus for an engine having a variable valve timing mechanism capable of varying valve timings of an exhaust valve and an intake valve establishes a combustion mode to...
6619241 Internal combustion engine and method for operating an internal combustion engine  
An internal combustion engine and a method for operating the multi-stroke combustion engine is disclosed. The engine is provided with individual variably controlled inlet and outlet valves in each...
6615771 Method for operating a direct injection internal combustion engine  
The invention relates to a method of operating a direct injection internal combustion engine operated on both spark-ignitable and autoignitable fuel, more specifically on gasoline, wherein the...
6571755 Two-stroke engine  
This invention provides a method of converting a four-stroke reciprocating piston engine into an efficient two-stroke engine breathing through the original overhead valves. This is achieved by...
6523504 Control system for controlling variable valve type internal combustion engine  
A control system for an engine comprises an operation range judging section that judges an operation range assumed by the engine, a variable cycle operating section that switches the operation of...
6499452 Selectable 2-stroke/4-stroke camshaft drive system  
A camshaft drive system is described for a selectable two-stroke/four-stroke internal combustion engine with exhaust and intake poppet valves opened and closed by at least one camshaft. In a...
6363907 Air induction control system for variable displacement internal combustion engine  
A control system for a variable displacement internal combustion engine determines effective flow cross sectional area as a predetermined function of a cross sectional area given against a throttle...
6286466 Internal-combustion engine  
A piston internal-combustion engine has a control system for controlling the number of strokes of the combustion process taking place inside a combustion space. As a function of operating...
6286467 Two stroke engine conversion  
A method is provided for converting a conventional four stroke internal combustion engine having four cylinders into a two stroke engine. The camshaft assembly including the camshaft having cams...
6257176 Variable cycle internal combustion engine and controller thereof  
A two-cycle action cam having two protruding parts 1a and 1b and a four-cycle action cam 3 having one protruding part 3a are selectively used by a cam change mechanism 46i. The two-cycle action cam...
5699758 Method and apparatus for multiple cycle internal combustion engine operation  
A method for operating a reciprocating piston-type internal combustion engine selectively in two-stroke, four-stroke, and six-stroke mode includes: providing transfer valves, transfer passage means...
5517951 Two stroke/four stroke engine  
A universal internal combustion engine that is electronically and reversibly convertible from four stroke operation to two stroke operation, the engine having intake and exhaust valves with an...
5454352 Variable cycle three-stroke engine  
A virtual three-stroke engine (1) with intake and compression strokes approximately one half of the power stroke of approximately 12 to one expansion ratio and with total firing cycle stroke...
5193492 2-4 Cycle change-over engine and its control system  
The present invention lies in a 2-4 cycle change-over engine and its control unit which perform 2 cycle running of the uniflow type by closing a suction valve at an upper portion of the engine and...
5191858 Dual cycle engine  
The invention relates to new and useful improvements in dual-cycle engine design and construction. The invention enhances the mechanical ability of such engines to automatically match the engine...
5158044 Engine selectively operable in two- and four-cycle modes  
An engine is selectively operable in two- and four-cycle modes by varying the timing to open and close intake and exhaust valves on the top of a cylinder. The engine comprises first and second...
5154141 Dual cycle engine process  
The invention relates to new and useful improvements in the exhaust and induction processes of the piston driven internal combustion engine. In the invention a gas ejector is used in conjunction...
5140953 Dual displacement and expansion charge limited regenerative cam engine  
A combination, in a supercharged expansible chamber engine having at least one cam driven piston, of a piston drive cam profile that alternately drives the piston to a higher or lower top dead...
5113805 Variable-cycle engine  
A variable-cycle engine selectively operable in different cycle modes, includes a cylinder having a first intake port and an exhaust port which are defined in an upper portion thereof, and a second...
5036801 Double cycle internal combustion engine  
To simplify the structure of a double (two and four) cycle internal combustion engine, the engine comprises a cylinder formed with a scavenging port and an exhaust port, a piston, a fuel injection...
5022353 Variable-cycle engine  
A variable-cycle engine operates in a two-cycle mode when the rotational speed of the engine is lower than a predetermined speed and in a four-cycle mode when the rotational speed of the engine is...
5010852 Heat engine  
A multifuel hybrid heat engine having an internal combustion system and an external combustion system wherein a coaxial array of three tappet valves controls the expansion from the external...
5007382 Cycle changeable engine  
This cycle changeable engine includes first intake valves for a four-cycle operation which are disposed in intake ports formed in a cylinder head, exhaust valves disposed in exhaust ports, second...
5005539 Engine cycle control system  
An engine cycle control system controls an engine so that it operates in a two-cycle mode when the rotational speed of the engine is lower than a predetermined speed and in a four-cycle mode when...
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